Optimising routing switch for Windows Server 2003 environment

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Aug 5th, 2008
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We have a number of VLANs with the interVLAN routing being performed by a Cisco 3550. Our servers are all Windows 2003 and workstations are XP SP2. I have my suspicions that all is not well, with many users complaining of slow logins and other network delays. My monitoring suggests this is not a bandwidth issue.

There are no ACLs implemented between most of the network segments, but I am wondering if perhaps certain necessary UDP traffic might not be forwarded properly (or at all) -- Kerberos, perhaps. I am very interested to hear if anyone has any tips on optimising the routing of traffic in such an environment. Should I be adding a swathe of protocols to an "ip forward-protocol" command? For example:

ip forward-protocol udp 88

Coupled with an ip helper-address command to point to the PDC?

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